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Related Concept Videos

Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...
IR Spectrum01:19

IR Spectrum

When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0% (complete...
IR Spectrometers01:25

IR Spectrometers

There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the C=O, C=N, and C=C occur between 1600–1850 cm−1.
The...
IR Absorption Frequency: Delocalization01:04

IR Absorption Frequency: Delocalization

Electron delocalization refers to the distribution of electrons across multiple atoms within a molecule rather than being confined to a single atom or bond. This phenomenon is common in systems with conjugated bonds—structures where alternating single and double bonds allow π-electrons to move freely across the network. The movement of electrons stabilizes the molecule and can affect various chemical properties, including vibrational frequencies observed in IR spectroscopy.
In IR spectroscopy,...

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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Published on: December 27, 2012

Metallic subwavelength structures for a broadband infrared absorption control.

Gabriel Biener1, Avi Niv, Vladimir Kleiner

  • 1Optical Engineering Laboratory, Faculty of Mechanical Engineering, Technion-Israel Institute of Technology, Haifa, Israel.

Optics Letters
|March 22, 2007
PubMed
Summary

Researchers developed a metamaterial film using subwavelength metallic plates to control resonator absorption. This method achieves broadband and broad-angle enhanced absorption in the mid-infrared range by tailoring conductivity for impedance matching.

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Area of Science:

  • Metamaterials and Nanophotonics
  • Optical Engineering

Background:

  • Controlling light absorption in resonators is crucial for various optical applications.
  • Metamaterial films offer unique electromagnetic properties for manipulating light.

Purpose of the Study:

  • To present a novel method for controlling resonator absorption using subwavelength metallic structures.
  • To demonstrate tailored conductivity for impedance matching in the mid-infrared spectrum.

Main Methods:

  • Fabrication of a subwavelength structure using thin metallic plates.
  • Characterization of the metamaterial film's optical properties.
  • Theoretical analysis and experimental validation of absorption control.

Main Results:

  • Achieved tunable absorption by controlling the conductivity of the metallic subwavelength structure.
  • Demonstrated broadband and broad-angle enhanced absorption.
  • Validated the method for the mid-infrared range (8-12 micrometers) using a NiCr structure.

Conclusions:

  • The proposed metamaterial film approach effectively controls resonator absorption.
  • This technique enables precise impedance matching for enhanced optical absorption.
  • The findings are applicable to mid-infrared technologies requiring broadband and broad-angle absorption.